training: add early-stop callback + lr=1e-5 for next run

Sync physix/ to merged tree (post train/ merge, pre 4ep/500step run)

add --system-ids flag; add job_train_single.py for damped_spring

Add checkpoint helpers + SFT hub push + GRPO resume

anti-hack rewards: gate simplicity on match>=.10, format on sim success, +match_dense +correctness_bonus, drop progress

drop redundant 'progress' reward (==match in single-turn); add lineage to W&B

loop.py: prominent W&B checkpoint logging (summary keys + table)

loop.py: PEFT-based adapter resume (overrides stale base path)

resume: --lora-adapter-repo support in loop.py

Initial physix-live source for HF Jobs training